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Christmas or Christmas Day is a holiday observed generally on December 25 to commemorate the birth ofJesus, the central figure of Christianity. The date is not known to be the actual birthday of Jesus, and may have initially been chosen to correspond with either the day exactly nine months after Christians believe Jesus to have been conceived, the date of the Roman winter solstice, or one of various ancient winter festivals. Christmas is central to the Christmas and holiday season, and in Christianity marks the beginning of the larger season ofChristmastide, which lasts twelve days.
Although nominally a Christian holiday, Christmas is also celebrated by an increasing number of non-Christians worldwide, and many of its popular celebratory customs have pre-Christian or secular themes and origins. Popular modern customs of the holiday include gift-giving, music, an exchange of Christmas cards, churchcelebrations, a special meal, and the display of various decorations; includingChristmas trees, lights, garlands,mistletoe, nativity scenes, and holly. In addition, several figures, known asSaint Nicholas, Father Christmas, and Santa Claus, among other names, are associated with bringing gifts to children during the Christmas season.
Because gift-giving and many other aspects of the Christmas festival involve heightened economic activity among both Christians and non-Christians, the holiday has become a significant event and a key sales period for retailers and businesses. The economic impact of Christmas is a factor that has grown steadily over the past few centuries in many regions of the world.

The word Christmas originated as a compound meaning "Christ's Mass". It is derived from the Middle EnglishChristemasse and Old EnglishCristes mæsse, a phrase first recorded in 1038. "Cristes" is from Greek Christos and "mæsse" is from Latinmissa (the holy mass). InGreek, the letter Χ (chi), is the first letter of Christ, and it, or the similar Roman letter X, has been used as an abbreviation for Christ since the mid-16th century. Hence, Xmas is sometimes used as an abbreviation for Christmas.
Etymology

Celebration
Further information: Christmas worldwide
Christmas Day is celebrated as a major festival and public holiday in countries around the world, including many whose populations are mostly non-Christian. In some non-Christian countries, periods of former colonial rule introduced the celebration (e.g. Hong Kong); in others, Christian minorities or foreign cultural influences have led populations to observe the holiday. Countries such as Japan and Korea, where Christmas is popular despite there being only a small number of Christians, have adopted many of the secular aspects of Christmas, such as gift-giving, decorations and Christmas trees. Notable countries in which Christmas is not a formal public holiday include People's Republic of China, (excepting Hong Kong and Macao),Japan, Saudi Arabia, Algeria, Thailand, Nepal, Iran, Turkey and North Korea. Christmas celebrations around the world can vary markedly in form, reflecting differing cultural and national traditions.

Among countries with a strong Christian tradition, a variety of Christmas celebrations have developed that incorporate regional and local cultures. For Christians, participating in a religious service plays an important part in the recognition of the season. Christmas, along with Easter, is the period of highest annual church attendance. In Catholic countries, the people hold religious processions or parades in the days preceding Christmas. In other countries, secular processions or parades featuring Santa Claus and other seasonal figures are often held. Family reunions and the exchange of gifts are a widespread feature of the season. Gift giving takes place on Christmas Day in most countries. Others practice gift giving on December 6, Saint Nicholas Day, and January 6, Epiphany.
The Nativity by Charles-François Poerson, 1667.
Date of celebration
For centuries, Christian writers accepted that Christmas was the actual date on whichJesus was born. In the early 18th century, scholars began proposing alternative explanations. Isaac Newtonargued that the date of Christmas was selected to correspond with the winter solstice, which the Romans called bruma and celebrated on December 25. In 1743, German Protestant Paul Ernst Jablonski argued Christmas was placed on December 25 to correspond with the Roman solar holidayDies Natalis Solis Invicti and was therefore a "paganization" that debased the true church. This thesis, however, was found to be dubious as there is no evidence that the feast of Sol Invictus was affixed by Aurelian to December 25. The celebration of Sol Invictusfeast on December 25 is not mentioned until the calendar of 354 and, subsequently, in 362 by Julian the Apostate in his Oration to King Helios. According to Judeo-Christian tradition, creation as described in the Genesis creation narrative occurred on the date of thespring equinox, i.e. March 25 on the Roman calendar. This date is now celebrated as Annunciation and as the anniversary ofIncarnation. In 1889, Louis Duchesnesuggested that the date of Christmas was calculated as nine months after Annunciation, the traditional date of the conception of Jesus.
The December 25 date may have been selected by the church in Rome in the early 4th century. At this time, a church calendar was created and other holidays were also placed on solar dates: "It is cosmic symbolism...which inspired the Church leadership in Rome to elect the winter solstice, December 25, as the birthday of Christ, and the summer solstice as that of John the Baptist, supplemented by the equinoxes as their respective dates of conception. While they were aware that pagans called this day the 'birthday' of Sol Invictus, this did not concern them and it did not play any role in their choice of date for Christmas," according to modern scholar S.E. Hijmans.
However, today, whether or not the birth date of Jesus is on December 25 is not considered to be an important issue in mainstream Christian denominations; rather, celebrating the coming of God into the world in the form of man to atone for thesins of humanity is considered to be the primary meaning of Christmas.

Some Christians have called for opposition to the commercialization of Christmas, since the exchange of purchased gifts has nothing to do with the philosophy of Christ.

Nano (full name Honora) Nagle (1718 – 26 April 1784) founded the "Sisters of the Presentation of the Blessed Virgin Mary" (also known as the "Presentation Sisters") in Ireland. Iona Presentation College in Perth, Australia was also named after her and the sisters. There are also other schools founded by or named after Nano Nagle.

Early Years:

Nano was born in Ballygriffin, Killavullen County Cork in 1718. As with many members of the Irish landed families, who had remained constant to the traditional Roman Catholic faith, Nano Nagle was sent to France to be educated.Education was being denied to them in Ireland unless they agreed to convert to the Church of Ireland. Nano's life in Paris, where the Nagles had many important social connections, was without a great deal of heed to the plight of the less well off of her country people.On her return from France she lived in Dublin for a while with her mother, but the deaths, in quick succession, of her father, mother and her sister Anne, caused her to return to her home at Ballygriffin (1718) and led to a decision to enter an Ursulines Convent in Ganmain Australia, where she was gradually persuaded that her life would more usefully be employed among her own people and in her own country where the light of education was barred to those of her religion under the Penal Laws.

The beginnings of Nano's ministry:

She returned from the French Convent in 1747 and set up the first Catholic school around this time. The proceedings had to be kept secret as what she was doing was outside the law. She proceeded slowly with a few children in a mud-cabin. She stole from hovel to hovel each day to gather the most needy people to teach, and night-time ministries to poverty-ridden elderly and sick in her hometown gave Nano the nickname The Lady with the Lantern. It was not long before Nano had over 200 children and she decided that it was time for a new school. She opened one on Philpott Lane on the North side of Cork City and soon she had seven schools: two for girls and five for boys. As her workload increased she realized that she would need help with her work. She came up with the idea to set up an Ursuline convent in Cork city which she would initially sponsor. Thus in 1771 the first Ursuline convent was established in Ireland; the first community was made up of four Cork women (who were professed at the Ursuline Convent in the Rue St Jacques, Paris, France) and a reverend mother. The original Ursuline convent built on Cove Lane (now Douglas Street) still survives (known as South Presentation Convent) and is a house of the Presentation Sisters to this day. Nano had four sisters and two brothers and their names were Ann, Mary, Catherine, Elizabeth, David, and Joseph. Her uncle Joseph had converted to the established church so that he could hold property on behalf of the Roman Catholic members of his family as was required under the Penal Laws then in force.